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87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
#ifndef DBMS_CORE_FIELD_H
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#define DBMS_CORE_FIELD_H
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#include <vector>
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#include <boost/variant.hpp>
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#include <boost/variant/recursive_variant.hpp>
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#include <boost/variant/static_visitor.hpp>
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#include <DB/Core/Types.h>
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namespace DB
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{
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/** Типы данных для представления единичного значения произвольного типа в оперативке.
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* Внимание! Предпочтительно вместо единичных значений хранить кусочки столбцов. См. Column.h
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*/
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typedef boost::make_recursive_variant<
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Null,
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UInt64,
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Int64,
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Float64,
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String,
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std::vector<boost::recursive_variant_> /// Array, Tuple
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>::type Field;
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typedef std::vector<Field> Array; /// Значение типа "массив"
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/** Числовое значение конкретного типа Field */
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namespace FieldType
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{
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enum Enum
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{
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Null = 0,
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UInt64,
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Int64,
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Float64,
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String,
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Array
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};
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}
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/** Возвращает true, если вариант - Null */
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class FieldVisitorIsNull : public boost::static_visitor<bool>
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{
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public:
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template <typename T> bool operator() (const T & x) const { return false; }
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bool operator() (const Null & x) const { return true; }
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};
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/** Возвращает числовое значение типа */
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class FieldVisitorGetType : public boost::static_visitor<FieldType::Enum>
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{
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public:
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FieldType::Enum operator() (const Null & x) const { return FieldType::Null; }
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FieldType::Enum operator() (const UInt64 & x) const { return FieldType::UInt64; }
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FieldType::Enum operator() (const Int64 & x) const { return FieldType::Int64; }
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FieldType::Enum operator() (const Float64 & x) const { return FieldType::Float64; }
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FieldType::Enum operator() (const String & x) const { return FieldType::String; }
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FieldType::Enum operator() (const Array & x) const { return FieldType::Array; }
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};
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template <typename T> struct NearestFieldType;
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template <> struct NearestFieldType<UInt8> { typedef UInt64 Type; };
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template <> struct NearestFieldType<UInt16> { typedef UInt64 Type; };
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template <> struct NearestFieldType<UInt32> { typedef UInt64 Type; };
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template <> struct NearestFieldType<UInt64> { typedef UInt64 Type; };
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template <> struct NearestFieldType<Int8> { typedef Int64 Type; };
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template <> struct NearestFieldType<Int16> { typedef Int64 Type; };
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template <> struct NearestFieldType<Int32> { typedef Int64 Type; };
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template <> struct NearestFieldType<Int64> { typedef Int64 Type; };
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template <> struct NearestFieldType<Float32> { typedef Float64 Type; };
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template <> struct NearestFieldType<Float64> { typedef Float64 Type; };
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}
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#endif
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